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Jagirdar Rukmini & Devarapalli Shanti Priya

Period variation studies of six contact binaries in M4

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Mots-clés : astronomie, astrophysique, binaires, étoiles, photométrie, variabilité

Abstract

We present the first period study of six contact binaries in the closest globular cluster M4 the data collected from June 1995−June 2009 and Oct 2012−Sept 2013. New times of minima are determined for all the six variables and eclipse timing (O-C) diagrams along with the quadratic fit are presented. For all the variables, the study of (O-C) variations reveals changes in the periods. In addition, the fundamental parameters for four of the contact binaries obtained using the Wilson-Devinney code (v2003) are presented. Planned observations of these binaries using the 3.6-m Devasthal Optical Telescope (DOT) and the 4-m International Liquid Mirror Telescope (ILMT) operated by the Aryabhatta Research Institute of Observational Sciences (ARIES; Nainital) can throw light on their evolutionary status from long term period variation studies.

Keywords : astronomy, astrophysics, binaries, photometry, stars, variability

To cite this article

Jagirdar Rukmini & Devarapalli Shanti Priya, «Period variation studies of six contact binaries in M4», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 198 - 202 URL : https://popups.uliege.be:443/0037-9565/index.php?id=7646.

About: Jagirdar Rukmini

Department of Astronomy, Osmania University, Hyderabad, Telangana – 500007, rukminiouastro@yahoo.com

About: Devarapalli Shanti Priya

Department of Astronomy, Osmania University, Hyderabad, Telangana – 500007, astroshanti@gmail.com